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如何提高短波频率资源在海上通信中的效率 被引量:1
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作者 王桂格 杨晓勤 沈华琳 《珠江水运》 2015年第7期50-51,共2页
本文首先介绍了短波通信的特点、现状及其在海上通信方面的应用,并阐述了一种短波通信技术在远海通信中的应用方法和途径,通过该方法能够有效利用有限的短波频率资源,解决不同的船舶电台占用同一频率信道无法实现收发信息等一系列诸多... 本文首先介绍了短波通信的特点、现状及其在海上通信方面的应用,并阐述了一种短波通信技术在远海通信中的应用方法和途径,通过该方法能够有效利用有限的短波频率资源,解决不同的船舶电台占用同一频率信道无法实现收发信息等一系列诸多问题。最后简要介绍了现代海上通信应用技术的发展趋势。 展开更多
关键词 短波通信 远海通信 电台资源 信道
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Performance of the Cloud-Based Commodity Cluster
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作者 Van-Hau Pham Duc-Cuong Nguyen Tien-Dung Nguyen 《Computer Technology and Application》 2013年第10期532-537,共6页
Traditional HPC (High Performance Computing) cluster is built on top of physical machines. It is usually not practical to reassign these machines to other tasks due to the fact that software installation is time con... Traditional HPC (High Performance Computing) cluster is built on top of physical machines. It is usually not practical to reassign these machines to other tasks due to the fact that software installation is time consuming. As a result, these machines are usually dedicated for the cluster usage. Virtualization technology provides an abstract layer which allows several different operating systems (with different software packages) running on top of one physical machine. Cloud computing provides an easy way for the user to manage and interact with the computing resources (the virtual machines in this case). In this work, we demonstrate the feasibility of building a cloud-based cluster for HPC on top of a set of desktop computers that are interconnected by means of Fast Ethernet. Our cluster has several advantages. For instance, the deployment time of the cluster is quite fast: We need only 5 min to deploy a cluster of 30 machines, Besides, several performance benchmarks have been carried out. As expected, the embarrassingly parallel problem has the linear relationship between the performance and the cluster size. 展开更多
关键词 Cloud computing HPC cluster VIRTUALIZATION performance.
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